Math Help, pleasee .?

Question

Over the summer I went to course that reviews grade 8 math and starts grade 9 math.. we got these equations that were a mix of order of operation, exponents,algebra and integers the got really confusing and I need someone to explain it to me!

They looked like this:

(-6a+7b²-5a²) x (3b²-(-4a)+7b+b)

I know the next step would be:

-6a-5a²-(-4a) + 7b²x3b²+7b+b

then i dont understand the rest!

Answer 1

you just have to group the like terms and if ur given the values of the variables then just substitute them

Answer 2

Did you mean to multiply them in the first part, because if you did the second step is wrong.

If you meant to put

(-6a+7b²-5a²) + (3b²-(-4a)+7b+b)

then here are the steps

First take away the parentheses inside the parentheses

(-6a + 7b² - 5a²) + (3b² + 4a + 7b + b)

Then take away the other sets of parentheses

-6a + 7b² - 5a² + 3b² + 4a + 7b + b

Then group like terms together - remember that a and a² are two different terms that can't be added or subtracted to each other

-6a + 4a - 5a² + 7b² + 3b² + 7b + b

Then combine like terms

-2a - 5a² + 10b² + 8b

And that's as far as you can go

Answer 3

the 7b² shud stay on the side that it started on and so shud the -4a u dont move them sides. ill see if i can work it out and sen u the answer

i get 4a cubed + 13bcubed

dont no how to do the little numbers lol

Answer 4

[-6a + 7b^2 - 5a^2][3b^2 - (-4a) + 7b + b]

= [-6a + 7b^2 - 5a^2][3b^2 + 4a + 8b]

= -6a*3b^2 + 7b^2*3b^2 - 5a^2*3b^2 - 6a*4a + 7b^2*4a - 5a^2*4a - 6a*8b + 7b^2*8b - 5a^2*8b

= -6ab^2 + 21b^4 - 15a^2b^2 - 24a^2 + 28ab^2 - 20a^3 - 48ab + 56b^3 - 40a^2b

= 21b^4 + 56b^3 - 6ab^2 + 28ab^2 - 15a^2b^2 - 40a^2b - 48ab - 24a^2 - 20a^3

= 21b^4 + 56b^3 + 22ab^2 - 15a^2b^2 - 40a^2b - 48ab - 24a^2 - 20a^3

Answer 5

now that's a tricky one, but no problem, lets see....

       (-6a+7b²-5a²) x (3b²-(-4a)+7b+b)

=(-6a+7b²-5a²) x (3b² + 4a + 8b)

=(-18 ab² -24a² -48ab)+(21b^4 + 28ab² + 56 b^3)+(-15a²b² -20a^3 -                                                                                           40a²b)

Now, rearranging,

= -24a² -20a^3 +56b^3 + 21b^4 - 48ab +10ab² -40a²b-15a²b

^ means raised to the power ( i dunno how to use superscript!)

hmpf! hope i helped!